Counterfeit drug trafficking is a multibillion dollar business that threatens the health and well-being of patients. The World Health Organization estimates 10 percent of medicines worldwide are counterfeit, including up to half of the drugs consumed in developing nations. Fortunately for Americans, the United States operates the safest prescription drug supply chain in the world. The U.S. Food and Drug Administration (FDA) oversees the most comprehensive drug approval and regulatory process, and the tightly operated distribution system helps prevent the entry and spread of counterfeit, adulterated or substandard medicines into the United States. The importation of unapproved medicines would undermine all of this.